qwt_plot_abstract_canvas.h

/******************************************************************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *
 * Modified by ChenZongYan in 2024 <czy.t@163.com>
 *   Summary of major modifications (see ChangeLog.md for full history):
 *   1. CMake build system & C++11 throughout.
 *   2. Core panner/ zoomer refactored:
 *        - QwtPanner → QwtCachePanner (pixmap-cache version)
 *        - New real-time QwtPlotPanner derived from QwtPicker.
 *   3. Zoomer supports multi-axis.
 *   4. Parasite-plot framework:
 *        - QwtFigure, QwtPlotParasiteLayout, QwtPlotTransparentCanvas,
 *        - QwtPlotScaleEventDispatcher, built-in pan/zoom on axis.
 *   5. New picker: QwtPlotSeriesDataPicker (works with date axis).
 *   6. Raster & color-map extensions:
 *        - QwtGridRasterData (2-D table + interpolation)
 *        - QwtLinearColorMap::stopColors(), stopPos() API rename.
 *   7. Bar-chart: expose pen/brush control.
 *   8. Amalgamated build: single QwtPlot.h / QwtPlot.cpp pair in src-amalgamate.
 *****************************************************************************/
 
#ifndef QWT_PLOT_ABSTRACT_CANVAS_H
#define QWT_PLOT_ABSTRACT_CANVAS_H
 
#include "qwt_global.h"
#include <qframe.h>
 
class QwtPlot;
 
class QWT_EXPORT QwtPlotAbstractCanvas
{
public:
    enum FocusIndicator
    {
        NoFocusIndicator,
 
        CanvasFocusIndicator,
 
        ItemFocusIndicator
    };
 
    // Constructor
    explicit QwtPlotAbstractCanvas(QWidget* canvasWidget);
    // Destructor
    ~QwtPlotAbstractCanvas();
 
    // Get the parent plot widget
    QwtPlot* plot();
    // Get the parent plot widget
    const QwtPlot* plot() const;
 
    // Set the focus indicator
    void setFocusIndicator(FocusIndicator);
    // Get the focus indicator
    FocusIndicator focusIndicator() const;
 
    // Set the border radius
    void setBorderRadius(double);
    // Get the border radius
    double borderRadius() const;
 
protected:
    QWidget* canvasWidget();
    const QWidget* canvasWidget() const;
 
    virtual void drawFocusIndicator(QPainter*);
    virtual void drawBorder(QPainter*);
    virtual void drawBackground(QPainter*);
 
    void fillBackground(QPainter*);
    void drawCanvas(QPainter*);
    void drawStyled(QPainter*, bool);
    void drawUnstyled(QPainter*);
 
    QPainterPath canvasBorderPath(const QRect& rect) const;
    void updateStyleSheetInfo();
 
private:
    QwtPlotAbstractCanvas(const QwtPlotAbstractCanvas&)            = delete;
    QwtPlotAbstractCanvas& operator=(const QwtPlotAbstractCanvas&) = delete;
 
    QWT_DECLARE_PRIVATE(QwtPlotAbstractCanvas)
};
 
class QWT_EXPORT QwtPlotAbstractGLCanvas : public QwtPlotAbstractCanvas
{
public:
    enum PaintAttribute
    {
        BackingStore = 1,
 
        ImmediatePaint = 8,
    };
 
    Q_DECLARE_FLAGS(PaintAttributes, PaintAttribute)
 
    // Constructor
    explicit QwtPlotAbstractGLCanvas(QWidget* canvasWidget);
    // Destructor
    ~QwtPlotAbstractGLCanvas();
 
    // Set a paint attribute
    void setPaintAttribute(PaintAttribute, bool on = true);
    // Test a paint attribute
    bool testPaintAttribute(PaintAttribute) const;
 
    // Set the frame style
    void setFrameStyle(int style);
    // Get the frame style
    int frameStyle() const;
 
    // Set the frame shadow
    void setFrameShadow(QFrame::Shadow);
    // Get the frame shadow
    QFrame::Shadow frameShadow() const;
 
    // Set the frame shape
    void setFrameShape(QFrame::Shape);
    // Get the frame shape
    QFrame::Shape frameShape() const;
 
    // Set the line width
    void setLineWidth(int);
    // Get the line width
    int lineWidth() const;
 
    // Set the mid line width
    void setMidLineWidth(int);
    // Get the mid line width
    int midLineWidth() const;
 
    // Get the frame width
    int frameWidth() const;
    // Get the frame rect
    QRect frameRect() const;
 
    virtual void invalidateBackingStore() = 0;
 
protected:
    void replot();
    void draw(QPainter*);
 
private:
    virtual void clearBackingStore() = 0;
 
    QWT_DECLARE_PRIVATE(QwtPlotAbstractGLCanvas)
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QwtPlotAbstractGLCanvas::PaintAttributes)
 
#endif